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    OpenAI

    gpt-oss-20b

    by OpenAItext->text13 endpoints
    Neura Intelligence Index
    32.5/ 100
    Rank
    #221—
    Confidence
    low
    Benchmarks
    3(8% coverage)

    Overview

    gpt-oss-20b is an open-weight 21B parameter model released by OpenAI under the Apache 2.0 license. It uses a Mixture-of-Experts (MoE) architecture with 3.6B active parameters per forward pass, optimized for...

    Capabilities

    Text generation
    Tool use / Function calling
    Structured output
    Extended reasoning
    Prompt caching
    Long context

    Modalities

    Input
    Text
    Output
    Text

    Technical Specifications

    Context Window
    131.1K tokens
    Max Output
    131.1K tokens
    Knowledge Cutoff
    2024-06-30
    Tokenizer
    GPT
    Uptime (24h)
    9991.8%
    Parameters
    20900000000B
    License

    Supported Parameters

    frequency_penaltyinclude_reasoninglogit_biaslogprobsmax_tokensmin_ppresence_penaltyreasoningreasoning_effortrepetition_penaltyresponse_formatseedstopstructured_outputstemperaturetool_choicetoolstop_ktop_logprobstop_p

    Benchmark Performance

    reasoning

    BenchmarkScoreSource
    GPQA Diamond
    71.5
    		verified
    Humanity's Last Exam
    10.9
    		verified

    agent

    BenchmarkScoreSource
    TAU-Bench Retail
    54.8
    		verified

    Performance Over Time

    Pricing

    Per 1M tokens
    Input$0.03
    Output$0.13
    Cache read$0.03
    OpenAI WebsiteHugging Face

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    Top-P sampling
    Stop sequences
    Deterministic seed
    Log probabilities
    apache_2_0Open Weights
    Country
    🇺🇸US
    Release Date
    August 5, 202511mo
    Added
    August 5, 2025
    Last synced 7/21/2026

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